Dear veronica, my server (zcs 7.2 on centos 5.3 ) now acting like this all mails incoming and outgoing are deferred. And i can't telnet to 10052 ports ..
I was upgrading from zcs 7.0 to 7.2 and this occurs ..

FYi, we're here managed to received the emails from the said domain but we could not send out to them . The problem only happen on these particular address. Is there any option to add on @xxx.xx into the MTA trusted network or else ?